There is no such thing. USB is digital, and as much as people want to believe that there is a difference, of course there are differences but any USB cable need to fall within specs, meaning that it meets the error rate requirement such that 1 sent arrives as a 1 and 0 sent arrives as a 0 within that allowed error rate. This is purely digital signal transmission, has nothing to do with digital-to-analog or anything that degrades the signal. And since the message sent is reassembled at the receiver, any erroneous message just got requested and resent again. Imagine your USB keyboard behaving differently using different USB cable, or your external USB harddrive writing different data using different USB cable. USB devices talk USB, meaning they exchange messages the USB way, whether the device is a keyboard or an external USB DAC. Any honest guy will tell you this exact thing, but as always it's up to you to listen to what you want.
